Questions tagged [esp8266]

An IC that offers Wi-Fi networking compatible with b/g/n standards. It also has integrated TCP/IP protocol stack. Extremely popular along IoT community as a low cost and powerful board.

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How to select which resistor is required for my curcuit to reduce voltage

I am trying to connect arduino and esp8266 as like this I know arduino runs at 5V and RX of ESP8266 should not have voltage more than 3.5V. If you see my diagram there voltage is large than need on ...
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ESP 8266-01 Library

I've just bought two of these wifi modules in the hope of setting up some sort of sensor network. Please could somebody recommend a good library for the arduino. Cheers
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Is it any way to connect ESP8266 to wifi faster?

I'm uploading this sketch to try connecting ESP to internet. However, most of the times I've ran it it takes a very long time to connect, a lot of times I've had to break the process because it seems ...
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How to reset ESP8266 wifi module

I have programmed ESP8266 to make it accessible over the network using below program. First Program #include <ESP8266WiFi.h> #include <WiFiClient.h> #include <ESP8266WebServer.h> ...
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Wifi proof with WeMos D1 ESP8266 Ad-Hoc

I am trying to use a WeMos module to send a broadcast message through an peer-to-peer network (Ad-Hoc). The thing is that i can't give a SSID nor Password to that network, i just can define it through ...
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How do I know the IP address assigned to an ESP8266?

I have programmed an ESP8266 using the circuit and program below. I tried to open the SerialMonitor once the program is uploaded to the ESP8266. I am getting an error when I am trying to open the ...
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746 views

Make RFID Tag as a variable

I want to make RFID Tag as a variable, and push it to the web server. But I struggle to do the Serial.read function. Any solutions? Here is my code #include <ESP8266WiFi.h> #include <SPI....
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1answer
524 views

Arduino Nano and ESP8266

I am trying to use Arduino Nano with ESP8266 (01). I tried to follow a lot of online tutorial with no result. In particular this one http://www.martyncurrey.com/arduino-to-esp8266-serial-commincation/...
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Error on sending AT+CWJAP_DEF commands to ESP8266

I am trying to send AT commands to ESP8266 to get connected with internet with the Wifi. When I am sending AT and AT+RST command on serial monitor then I am getting OK and ready response which seems ...
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Problems adding ESP8266 wifi board

I just received an ESP8266 wifi module and I am trying to add the board. However I am having an issue. All websites/tutorials say to use http://arduino.esp8266.com/stable/package_esp8266com_index.json,...
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How to connect an Arduino to WIFI using an ESP8266

Hi I am trying to make Arduino Uno on local network with the help of ESP8266 wifi module. I tried to search on internet, found mostly they are making ESP8266 as web server.http://circuits4you.com/...
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1answer
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Data transmission Serial to TCP

I am trying to send numeric data using ESP8266 to local network python server. Before that I am collecting data from sensors using Arduino UNO and then send it to ESP using hardware serial. ESP8266 ...
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WeMOS creating soft access point from old code even when new code doesn't have it

In the past I uploaded the code below: #include <ESP8266WiFi.h> #include <WiFiClient.h> #include <ESP8266WebServer.h> #include <DHT.h> #define DHTTYPE DHT22 // DHT 11 #...
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ESP8266 TCP connection WiFiClient issue

I am using ESP8266 01 board to send some data via TCP to server on local network. My code is: #include <ESP8266WiFi.h> const char* ssid = "ssid"; const char* password = "pas"; const char* ...
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1answer
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Sending value from Arduino to MySQL using ESP8266

I am trying to send a value from Arduino to a remote MySQL. I am following this tutorial. I have tried but no data is received on the server. What is the issue? I am new to Arduino. My code is: int ...
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Can't send AT comands to ESP8266 on any baud rate

I have problem with baud rate. I have changed baud rate of esp from 115200 to 9600 with AT command AT+CIOBAUD. And everything worked fine until I wanted to change it back and executed command AT+...
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Getting an error while uploading code to Arduino when ESP8266 is attached

I am trying to use an ESP8266 and an Arduino to access the Arduino from the network. I tried to do something but I'm facing some challenges. I hope I am using the correct board "Generic ESP8266 Module"...
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How does Arduino WiFi Shield connect to Blynk and How can I use ESP Module to connect to blynk?

I was actually quite impressed how easily Blynk gets connected to Arduino. So I had a doubt how does Arduino WiFi Shield allow Arduino Uno to connect to blynk ? And my second doubt is how can I use ...
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How does ESP8266 work as web server with Arduino?

I am trying to learn internet of things with smart home. I will connect an ESP8266 and an Arduino with the IBM Bluemix server to control a circuit from a public IP. I want to start with the local ...
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ESP8266 - Parsing last char from a string

I'm trying to parse the last character from the string of the reply from server and print them to serial monitor. My arduino code: // This will send the request to the server client.print(String("...
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1answer
293 views

WiFi connections being lost on connection reset

Look at the trick in the last few lines of this code: #include <ESP8266WiFi.h> const char* ssid = "xxxxx"; const char* password = "yyyyyyy"; // Create an instance of the server // specify the ...
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2answers
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How to use ESP8266 for wireless communication? [closed]

I saw many tutorial explaining how to program ESP8266 but Specifically I didn't get any tutorials explaining how to use with Arduino or any other Microcontroller for Wireless Communication. I had a ...
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217 views

ESP8266 sometimes stuck on AT+CIPSEND with “busy s…”

I'm using an ESP8266-01S Wi-Fi module on an Arduino UNO. When I use AT+CIPSEND=4 and then type test it successfully sends that message to my laptop. However, sometimes the module returns a busy s... ...
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NodeMCU powered with battery and use WiFi

I'm running a project with a nodeMCU DevKit and my project runs smooth if I run it connected through the usb wire to the computer. I need to run my project using battery and I tried with a ICR14500 ...
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How to connect arduino with local network

I am trying to connect Arduino with local network. This will act as a web server, client would be android mobile app or web browser. These are on same local network. Do I need Ethernet Shield or ...
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1answer
447 views

ESP8266 ESP-12 Connection

I am connected with my ESP-12 through a programmer and all the AT functions work correctly. However I do not get a connection when connecting to the ESP8266 module. I have done the following: Set ...
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1answer
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Gravity fan does not work when powered by 3.3V ESP8266

The gravity fan has 3 pins. I connected one pin to the ground, one pin to the digital pin numbered 2 on ESP8266. I uploaded this code but the fan doesn't run at all. The fan supposedly uses a 5V power ...
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1answer
534 views

ESP8266 unstable connection

I try to flash an ESP12E microcontroller through an FTDI serial converter. It seems like the UART connection is a bit unstable, because when I try to flash it via esptool it often throws "Timed out ...
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427 views

SoftwareSerial response is semi-gibberish using ESP8266

I have a working SoftwareSerial connection to my ESP8266 module on my Arduino UNO board. However, the response I get from the ESP8266 using the SoftwareSerial library is semi-gibberish. So I do get ...
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362 views

How do I send HTTP request using ESP8266 to other port than 80?

I currently have a working connection to my ESP8266 module. However, I can only connect to a server using the port 80, is it possible to choose a different port? I can connect using AT+CIPSTART="TCP"...
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ESP8266 (ESP-01) Not booting with load on IO pin 2

I'm using an ESP-01 to control a load (SSR), which is connected to IO pin 2. This pin needs to be HIGH at boot time, otherwise the module won't boot. I've tried driving the load with an optocoupler to ...
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359 views

How can I learn to use Generic ESP8266 boards Libraries in Arduino?

I am new to ESP8266. I am using the Arduino IDE to program the ESP8266-01 module. How can learn to make my own codes for ESP using Arduino? I am going through the example programs and learning which ...
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ESP8266-01 connected to Arduino Mega - Current output?

I was thinking of powering my arduino with an external 9 V power source, but I am still trying to figure out the best way to get the right amount of current for the Wi-Fi module. Should I use an ...
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1answer
368 views

How to make ESP8266-1S module work on Arduino Uno?

I currently have an Arduino Uno with an ESP8266-1S. However I can't make them work... I use the ESP8266wifi.h library and its connection functions do return a true (returns true when received a valid ...
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1answer
2k views

Adafruit Huzzah espcomm_open failed

I recently bought an adafruit huzzah as well as a serial to usb cable to connect it to my computer running windows 10. I was able to get the board set up in arduino following the directions found here....
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1answer
642 views

ESP8266 cannot handle struct

The following code works on a range of Arduino's but not on ESP. It returns random data for ID and Pin. The other two fields are always empty. I use the Arduino IDE for both the ESP and the Arduino's....
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1answer
608 views

ESP8266 + Slack (ssl->need_bytes=16432 > 6859)

I'm trying to connect an Adafruit Huzzah ESP8266 with Slack. I'm facing an issue with the connection I'd like some help or tips on. I'm able to get a connection sometimes, but sometimes during the ...
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361 views

How to reset Arduino with ESP shield?

I'm working on the wifi uploading to Arduino over ESP shield (eg. ESP-12). When uploading over USB Arduino IDE resets the boards first (using DTR) and then interacts with the bootloader. How can i ...
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NodeMCU espcomm_sync failed

I have a NodeMCU ESP12E DevKit V2 from Geekcreit. I had it working some months ago, but now I cannot upload to it. I am using the arduino IDE and I've set the "Additional Boards Manager URLs"...
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1answer
332 views

Nano + ESP8266 control pins with REST API

I connected and flashed successfully an ESP8266 module to a Nano. Now I want to control pins values with a REST API, but all the libraries I found are for using standalone ESP8266 modules (without ...
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My ESP8266 01 is saying at espcomm_sync failed, espcomm_open failed, and (2x) espcomm_upload_mem failed. OS X

I'm extremely frustrated at my ESP8266 right now, with the Arduino. I am using a 6v DC battery power supply (4xAA batteries), and a 3.3v voltage regulator (NTE1904). I have the connections as shown: ...
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1answer
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Uploading Arduino code, OTA, via connected ESP8266-12E running Esp-Link

1. A short preliminary introduction I'm deploying a small network of three MEGAs connected trough an RS-485 bus. Each MEGA is connected to up to 16 push-buttons (wall-mounted) and two relay-module (...
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1answer
233 views

ESP8266 not sending temperature data to text message

i am trying to use a ESP8266 module to send temperature data using twilio and send it to my phone via text message. However it does not send the sensor data but the text i placed. Is it possible if i ...
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ESP 8266 module outputting garble

I have ESP8266 shield for the Arduido (http://www.ebay.com.au/itm/like/201612329295?chn=ps). It was working but now it's not. I ran the command AT+UART_DEF=115200, 8, 1, 0, 3 and since running that ...
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Help using thermistor with esp8266

So I am trying to use this thermistor to measure temperature and with this code below it always puts the same value (2147483647). I used this tutorial to do the wiring and coding. I don't think the ...
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1answer
6k views

How to send data in response to HTTP get request from ESP8266?

I'm trying to control some RGB LEDs with ESP8266. I have built an HTML page to set the color and send the RGB color code to the ESP using HTTP get request. Everything works as expected. I just want to ...
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701 views

Fastest way to send serial commands and do something

I am trying to send a lot of serial commands really fast. I basically need to change color of my LED strip many times per second (10 times per second should really be enough). If I do this over WiFi, ...
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1answer
6k views

WiFiEsp not working on Software Serial, working fine on Hardware Serial

What I want to achieve I want to connect to my wifi network using Arduino UNO and ESP8266 using WiFiEsp.h library over `SofwareSerial, since UNO doesn't have additional H/W serial. What I am able to ...
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2answers
757 views

Fast I2C communication between ESP8266 & PCF8591

I need faster communication between the ESP and the ADC, so I found this https://github.com/pasko-zh/brzo_i2c. Original wire Example #include "Wire.h" #define PCF8591 0x48 byte a0; void setup() { ...
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1answer
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Send serial commands through IDE while RX pin is in use

This is really a two part question. I have an ESP8266 hooked up to USB. I have connected my LED strip (WS2812B LEDs) to the RX port, so I can control them individually and so on. I realised WiFi is a ...

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